Lining, a haul truck body comprising the same and a haul truck

ABSTRACT

The disclosure relates to a lining for a haul truck body, said lining being arranged to extend over a haul truck body for carrying a load, wherein the lining is formed by a plurality of lining elements comprising at least a first type of lining elements, termed load-breaking lining elements, and a second type of lining elements, different from the load-breaking lining elements, said load-breaking lining elements being structured and arranged to restrict, to a higher degree than the second type of lining elements, movement of said load in relation to the lining. The disclosure further relates to a haul truck body comprising the lining and a haul truck comprising the haul truck body.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the U.S. national stage application of InternationalApplication PCT/EP2018/066652, filed Jun. 21, 2018, which internationalapplication was published on Dec. 27, 2018, as International PublicationWO 2018/234497 A1 in the English language. The International Applicationclaims priority of European Patent Application No. 17177445.8 filed Jun.22, 2017.

TECHNICAL FIELD

The disclosure relates to a lining for a haul truck body. The disclosurefurther relates to a haul truck body comprising the lining and to atruck comprising the haul truck body.

BACKGROUND

Haul trucks are off-highway dump trucks engineered for use inhigh-production mining and heavy-duty construction environments. Thehaul trucks are equipped with haul truck bodies capable of accommodatinga large amount of material, such as rock, crushed ore or the like. Haultruck capacities range from 40 short tons (36 t) to 496 short tons.Hauling such masses of often sharp and heavy load makes the haul truckbody experiencing a heavy wear due to impact and abrasion.

To protect the surface of the haul truck body, it is common to equip theinterior of the haul truck body with a lining. The lining is typicallymade from materials having a high degree of resistance for damage.Whereas the haul truck body usually is made from steel, the liningmaterial is often made from another material. One commonly used type oflining is an elastic lining comprising for example a rubber material orpolyurethane. An advantage of the elastic lining material is that itsmaterial properties may be used to mitigate the effects of heavy impactof material on the haul truck body as material is hauled from quite somealtitude onto the haul truck body from for example an excavator. Theelastic lining material effectively absorbs the energy from the impactdistributing said energy over a larger area, thus preventing damage tothe haul truck body and/or structural parts of the haul truck, such asbeams, shafts, tires etc. Lining elements for haul trucks may alsocomprise less elastic materials as separate layers of the liningelements and/or as embedded inlays in the lining element. Such liningelements are specifically resistant to damage due to abrasive wear.Another advantage with the lining is that it may contribute in keepingthe load more stable, supported on the lining of the haul truck body,during transport. Lining for haul trucks are usually made from aplurality of lining elements extending over surfaces of the haul truckbody to form the lining. The separate lining elements simplifiesmanufacture by limiting its dimensions and mass. Moreover, itfacilitates service of the haul truck body, as individual damaged orworn-out lining elements may be exchanged directly on site withouthaving to remove large parts of the surrounding lining.

Still, however, there is a need in the art to provide an improved liningwith improved properties.

SUMMARY OF INVENTION

In the light of the above, it is an object of the present disclosure toprovide an improved lining for a haul truck body.

According to a first aspect, there is provided a lining being arrangedto extend over a haul truck body for carrying a load, wherein the liningis formed by a plurality of lining elements comprising at least a firsttype of lining elements, termed load-breaking lining elements, and asecond type of lining elements, different from the load-breaking liningelements, said load-breaking lining elements being structured andarranged to restrict, to a higher degree than the second type of liningelements, movement of said load in relation to the lining.

The lining according to the first aspect presents at least the followingadvantages:

-   -   By using lining elements with a higher degree of load-braking        properties, termed load-braking lining elements, which are        structured and arranged to restrict, to a higher degree than a        second type of lining elements, movement of said load in        relation to the lining, the lining may be designed such as to        prevent, at one or more regions where needed, the load from        moving as easy as it would have done on lining elements having a        lesser degree of load braking properties. In other words, the        risk of the whole load accidently starting to slide on top of        the lining may be reduced. This may be advantageous for at least        two reasons:        -   The load may be kept more stable, supported on the lining of            the haul truck body, during transport. Haul trucks are often            operated on inclined and irregular road surfaces and the            risk of accidently releasing parts of the load is sometimes            high.        -   The load may be prevented from being transiently released            during tipping, i.e. when the haul truck body is pivoted for            releasing the load. The transiently releasing occurs due to            the load of the haul truck suddenly losing its grip with the            surface of the lining, resulting in the load sliding            backwards over the surface of the lining basically all at            once as a sliding pile of material. The sliding results in a            relatively fast variation of the center of mass in relation            to the haul truck, putting high degree of strain to the            structural parts of the haul truck, such as bearings,            hydraulic systems etc. When tipping a haul truck body            provided with a lining of the disclosure, the risk of the            entire load starting sliding on the lining will be reduced.            By tailoring the load-breaking properties of the lining, it            may be achieved that the upper portions of the load will            start moving on top of the lower portions of the load to be            released at a tipping end of the haul truck body. As the            tilting angle increases, more of the load will be released,            subsequently ending with the bottom portion which is in            contact with the lining. Thus, the inventive concept may            reduce the risk that the release of the load will show the            transient behavior expected from a conventional haul truck            body of steel and/or equipped with a conventional lining            having less strong load-breaking properties, a transient            behavior characterized by a sudden onset of movement as the            load loses its grip to the lining upon which it resides.    -   Using specific lining elements with different load-breaking        properties for different regions of the haul truck body may        achieve the advantages disclosed hereinabove, but, additionally,        further advantages. One such advantage is to prevent the load        from sticking to the lining which may increase the carry-back.        The different regions are equipped with lining elements having        different load-braking properties, i.e. lining elements being        structured and arranged to restrict movement of a load in        relation to the lining to a different degree. By using        load-braking lining elements on selected regions of the haul        truck body and a second type of lining elements, different from        the load-breaking lining elements, on other regions of the haul        truck body, a lining may be provided having reduced degree of        sticking, and thus reduced carry back, while at the same time        having a higher degree of load-braking capability.    -   Furthermore, by using specific kinds of lining elements in        limited regions, it may be overall cost-effective to make use of        more expensive lining in that region, lining elements which        would not be cost effective to use over the whole lining.

According to some embodiments, the load-carrying surfaces of theload-breaking lining elements present, compared to load-carryingsurfaces of the lining elements of the second type, a higher surfacefriction for restricting movement of the load in relation to the lining.

According to some embodiments, the plurality of lining elementscomprises an elastic material, such as rubber, and wherein theload-breaking lining elements, compared to the lining elements of thesecond type, comprises a softer elastic material arranged to be deformedby the weight of the load in order to restrict movement of the load inrelation to the lining.

According to some embodiments, load-carrying surfaces of theload-breaking lining elements present, compared to load-carryingsurfaces of the lining elements of the second type, a lowerload-cohesion force for restricting movement of the load in relation tothe lining.

According to some embodiments, the lining comprises a bottom lining, afront lining and two opposite side linings, and wherein the bottomlining comprises at least one load-breaking bottom region formedentirely or partly by load-breaking lining elements, and one or morefurther bottom regions, different from the load-breaking bottom region,formed entirely or partly by lining elements of the second type.

According to some embodiments, the load-breaking bottom region isarranged at least partly over a load-impact region of a forward part ofthe haul truck body.

According to some embodiments, the load-breaking bottom region isarranged at a distance from a front end of the bottom lining.

According to some embodiments, the load-breaking bottom region isarranged at a distance from a rear end of the bottom lining.

According to some embodiments, each one of said two opposite sidelinings comprises at least one load-breaking side region formed entirelyor partly by load-breaking lining elements.

According to some embodiments, the second type of lining elements aredesigned as load-releasing lining elements which are structured anddesigned to promote, to a higher degree than the load-breaking liningelements, release of the load from the lining and/or movement of theload in relation to the lining.

According to some embodiments, at least some of said load-releasinglining elements are arranged in a front lining of said lining.

According to a second aspect, there is provided a haul truck bodycomprising a lining according to the first aspect.

According to a third aspect, there is provided a truck comprising a haultruck body according to the second aspect.

Hereinabove has been provided a description of an inventive concept. Itis understood that many alternatives are available to the skilled personin realizing the inventive concept within the scope of the appendedclaims. Further to what has been detailed hereinabove, it is providedexamples of such alternatives in what follows below.

In an example, there is disclosed a lining for a haul truck body, saidlining being arranged to extend over surfaces of said haul truck body,wherein said surfaces define at least one impact region and at least onewear region;

-   -   wherein said lining within said at least one impact region        presents one or more impact lining elements;    -   wherein said lining within said at least one wear region        presents one or more wear lining elements; and    -   wherein said impact lining elements have a higher impact        resistance than said wear lining elements and said wear lining        elements have a higher wear resistance than the impact lining        elements.

The lining according to the example presents at least the followingadvantages:

-   -   Using specific lining elements for different regions of the haul        truck body achieves an improved overall resistance of the lining        to the often aversive effects of material loaded into, and        tipped out from, the haul truck body during use.    -   By tailoring lining elements for resisting a specific kind of        damage, the tailored lining elements may be made superior in        resistance to that specific kind of damage.    -   By using specific kinds of lining elements in limited regions,        it may be overall cost-effective to make use of more expensive        lining in that region, lining elements which would not be cost        effective to use over the whole lining.

The at least one impact region may comprise a loading region extendingover a part of a bottom surface of the haul truck body, wherein the atleast one wear region comprises a tipping region extending over anotherpart of the bottom surface of the haul truck body, and wherein theloading region is arranged in front of the tipping region.

The loading region and the tipping region may together extend over theentire bottom surface of the haul truck body. Alternatively, thereloading region and the tipping region may together partially extend overthe bottom surface of the haul truck body. Further regions may bearranged to extend over the bottom surface, such as for example a thirdregion extending between the loading region and the tipping region.

The tipping region may extend to a rear end of the bottom surface of thehaul truck body.

The loading region may extend forwardly from a center of the bottomsurface of the haul truck body.

The at least one impact region may further comprise a further loadingregion extending over at least a part of a front surface of the haultruck body.

The one or more impact lining elements may have a larger thickness thanthe one or more wear lining elements.

The one or more impact lining elements and the one or more wear elementsmay comprise different materials.

The one or more impact lining elements and/or the one or more wearlining elements may comprise one or more from rubber, polyurethane,ceramics and metallic alloys. The rubber may be either synthetic ornatural or a mix thereof.

The one or more impact lining elements may have a Young's modulus lowerthan a Young's modulus of the one or more wear lining elements.

The one or more wear lining elements may comprise one or morewear-resistant portions, or particles, at least partly embedded withinthe one or more wear lining elements and distributed over at least apart of an outwardly directed surface of the one or more wear liningelements, such that the one or more wear-resistant portions are arrangedto make contact with material present in said haul truck body.

The one or more wear-resistant elements may comprise a ceramic materialand/or a metallic alloy.

The one or more wear lining elements may comprise a wear layer facingthe inside of the haul truck body and a mounting layer facing surfacesof the haul truck body, and wherein the wear layer comprises the one ormore wear-resistant portions.

The one or more impact lining elements may comprise are a plurality ofimpact lining elements and the one or more wear lining elementscomprises a plurality of wear lining elements.

Said plurality of impact lining elements may be arranged adjacent toeach other such as together to form one or more areas of substantiallyuniform impact resistance, and wherein said plurality of wear liningelements are arranged adjacent to each other such as together to formareas of substantially uniform wear properties.

A haul truck body may comprise a lining according to the exampledisclosed hereinabove.

A truck may comprise a such a haul truck body.

The two types of lining elements presenting different load-breakingproperties may be combined with the impact and wear lining elements.This may be achieved by using lining elements of four different types.Alternatively, less than four types of lining elements may be used. Insuch a case, some types may share functionality. For example, one typeof lining elements may be used both as an impact lining element and as aload-breaking lining element.

Effects and features of the first aspect, are, when applicable, relevantalso in connection with the subject matter disclosed in the example.

The above and other features of the inventive concept and preferredembodiments thereof are set out in the claims and will be describedfurther in detail below.

Terminology

The term “lining element” is to be interpreted as an isolated physicalelement adapted to be positioned onto a surface or other structure suchas to provide a protection thereof. A lining element may be planar, butmay also be curved or three-dimensionally shaped. A lining element maycomprise more than one material. A lining element may be shaped such asto fit together with adjacent lining elements to form a uniform commonsurface.

The term “region” should be understood as a region of the haul truckbody which, in absence of lining elements thereon, would be directlyexposed to material hauled by the haul truck body. Thus, the region maybe a uniform surface, such as a bottom surface of a steel haul truckbody. Alternatively, a region may, at least in part, comprise subregions lacking a surface. For example, lining elements may be suspendedover a frame structure of a haul truck body.

The term “impact region” would normally be a region of the haul truckbody where the load is normally loaded, with resulting high impact onthe haul truck body. Such impact would often be in the forward part ofthe haul truck body, such as in the front third of the bottom of thehaul truck body.

The term “wear region” would normally be a region where the lining ispredominantly subjected to wear by the load moving over the lining. Sucha region may especially be located in the rear part of the haul truckbody, such as at or close to the rear end of the bottom of the haultruck body.

The terms “in front of” and “rear” used in relation to the haul truckbody should be interpreted as relating to a reference direction beingthe forward direction of a haul truck comprising the haul truck body.

The terms “elasticity” and “Young's modulus” when used in relation to alining element should here be understood as effective values for thelining element. This implies that if a lining element is made from twoor more materials each having a respective Young's modulus, the liningelement may still be associated with a single effective Young's modulus,which for example may be determined experimentally.

Other features and advantages of embodiments of the present inventionwill become apparent to those skilled in the art upon review of thefollowing drawings, the detailed description, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The inventive concept, some non-limiting embodiments and furtheradvantages of the inventive concept will now be further described withreference to the drawings.

FIG. 1 illustrates a haul truck body having a lining according to someembodiments of the disclosure.

FIG. 2 a is a perspective view of a wear lining element according toembodiments of the disclosure.

FIG. 2 b is a cut-out view of the wear lining element shown in FIG. 2 a

FIG. 3 a illustrates a haul truck body having a lining according to somealternative embodiments of the disclosure.

FIG. 3 b is a top view of sections of the lining shown in FIG. 3 a.

FIG. 4 a illustrates a haul truck body having a lining according to somealternative embodiments of the disclosure.

FIG. 4 b is a top view of sections of the lining shown in FIG. 4 a.

DETAILED DESCRIPTION

FIG. 1 shows a haul truck body 10 for a haul truck 1. The haul truck 1is typically an off-highway dump truck engineered for use inhigh-production mining and heavy-duty construction environments. In use,the haul truck 1 will receive, in the haul truck body 10, a load ofmaterial, such as crushed stone, ore or the like, from another machinesuch as an excavator or a wheel loader. The haul truck 1 may then beused to move the load of material to other areas within a working area,for example to a processing facility such as a crusher. The haul truck 1is arranged to swivel the haul truck body 10 around a pivot axis at theend of the haul truck 1, such that the load may be tipped off the haultruck body 10.

The haul truck body 10 is made from steel and comprises a front end 16and a rear end 18. The front end 16 comprises a canopy 20 for protectingthe drivers cab 22. The haul truck body 10 comprises a bottom surface 12connecting to a front surface 14 and two side surfaces 24,26. The frontsurface 16 connects to the canopy 20.

To protect the haul truck body 10 from damage due to the heavy materialbeing hauled into, and tipped out from the haul truck body 10, surfacesof the haul truck body 10 is covered with a lining 100. As can be seenin FIG. 1 , the lining 100 is arranged to extend over inner surfaces ofsaid haul truck body 10. The lining of FIG. 1 will be further describedlater.

Turning now to FIGS. 3 a and b , a lining 300 will now be described. Thelining 300 is arranged to extend over a haul truck body 30 for carryinga load. The haul truck body 30 may be entirely or partly lined. The loadtypically comprises minerals, stones, sand, clay, gravel or the like,and is hauled into the haul truck body 30 at a front portion thereof.Typically, the front portion of the haul truck body 30 covers the fronthalf of the haul truck body 30. Specifically, according to someembodiments, the front portion of the haul truck body 30 covers thefront ⅓ of the haul truck body.

The lining 300 is formed by a plurality of lining elements comprising atleast a first type of lining elements, termed load-breaking liningelements 320, and a second type of lining elements, different from theload-breaking lining elements 320. In the illustrated embodiment, thelining elements of the second type may be termed load-releasing liningelements 330. The load-breaking lining elements 320 are structured andarranged to restrict, to a higher degree than the second type of liningelements, movement of said load in relation to the lining 300.

The lining 300 comprises a bottom lining 305 d, a front lining 305 c andtwo opposite side linings 305 a,305 b. The bottom lining 305 d comprisesat least one load-breaking bottom region 340 formed entirely or partlyby load-breaking lining elements 320. The lining 300 comprises one ormore other regions formed entirely or partly by lining elements of thesecond type as will be discussed below.

The load-breaking bottom region 340 is arranged at least partly over aload-impact 341 region of a forward part of the haul truck body 30 wherethe main impact occurs when the load is loaded into the haul truck body30. In the illustrated embodiment, the load-breaking bottom region 340is arranged at a distance from a front end 316 of the bottom lining 305d and at a distance from a rear end 318 of the bottom lining 305 d.Thus, the load-breaking bottom region 340 may be arranged such as tocover a central region of the bottom lining 305 d. In the illustratedembodiment, the load-breaking region 340 extends laterally to thelateral sides of the bottom. In other embodiments, the load-breakingregion may be arranged at a distance from the lateral sides of thebottom.

In addition, load-breaking lining elements 320 may be arranged to coverside walls of the haul truck body 30. Specifically, for the embodiment,each one of said two opposite side linings 305 a,305 b comprises atleast one load-breaking side region 342 a,342 b formed entirely orpartly by load-breaking lining elements 320.

The bottom lining 305 d further comprises one or more further bottomregions, different from the load-breaking bottom region 340, formedentirely or partly by lining elements of the second type. The liningelements of the second type are designed as load-releasing liningelements 330 which are structured and designed to promote, to a higherdegree than the load-breaking lining elements 320, release of the loadfrom the lining and/or movement of the load in relation to the lining300.

The load-releasing lining elements 330 are typically used at locationswhere material tend to stick, i.e. locations especially prone tocontribute to the carry-back problem. One such location is in the frontof the haul truck body. Thus, at least some of said load-releasinglining elements 340 may be arranged in a front lining 305 c of thelining. The lining 300 comprises a load-releasing front region 348covering all, or at least a part, of the front lining 305 c. Otherload-releasing lining elements 340 may be arranged on the side walls.Specifically, for the lining 300, each one of said two opposite sidelinings 305 a,305 b may comprise a forward load-releasing side region344 a,344 b formed entirely or partly by load-releasing lining elements330. Each load-releasing side region 344 a,344 b may be arranged infront of a respective load-breaking side region 342 a,342 b on arespective side lining 305 a,305 b. Other load-releasing lining elements340 may be arranged within the bottom lining 305 d. Specifically, thelining 300 may further comprise a load-releasing bottom region 346arranged in front of the load-breaking bottom region 340. In alternativeembodiments, the load-releasing lining elements 340 may be arranged inthe load-releasing front region 348 only or in the forwardload-releasing bottom region 346 only.

The load-releasing lining elements 340 may preferably be arranged alsoat edge and/or corner portions of the lining 300. This may reduce therisk of material sticking to the edge and corner portions to increasethe carry-back.

FIGS. 4 a and b show a lining 400 according to another embodiment. Thelining 400 is similar to the lining 300, but differs in that the lining400 further comprises an impact region 441 arranged such as to cover atleast a part of a central region of the bottom lining 405 d where themajor part of the load normally impact on the haul truck body 30 duringloading. The load-breaking bottom region 440 is arranged at least partlyover a load-impact region 341 of a forward part of the haul truck body30. However, the load-breaking bottom region 440 is arranged to partlysurround the impact region 441 such that the load-breaking bottom region440 covers parts of the bottom lining 405 d to the rear of theload-breaking bottom region 440 and parts of the bottom lining 405 d atopposite sides of the load-breaking bottom region 440. The lining 400within the loading region 441 presents one or more lining elementresistive for impact. Such a lining element may comprise impact liningelements 130 as disclosed herein.

The lining 400 in FIGS. 4 a and 4 b further comprises a wear region 443extending to the rear end 419 of the bottom surface of the haul truckbody 30. The lining 400 within said wear region 443 presents one or morelining elements having a relatively high resistance to wear. Such liningelements may comprise wear lining elements 140 as disclosed herein.

The ability of the load-braking lining elements 320 to resist loadmovement may be achieved in different ways. It may be achieved by theload-carrying surfaces of the load-breaking lining elements 320presenting, compared to load-carrying surfaces of the lining elements ofthe second type, a higher surface friction for restricting movement ofthe load in relation to the lining 300,400. The higher surface frictionmay be described by the static and dynamic friction coefficients of thelining material. The load-braking lining elements 320 are characterizedby having at least a higher static friction than the second type oflining elements. They may, additionally, comprise a higher dynamicfriction coefficient than the second type of lining elements. However, ahigher static friction coefficient is advantageous as it allows forkeeping the load in place rather than merely limiting the speed of aload already moving upon the lining. It is anticipated that it isadvantageous to tailor the load-braking lining elements 320 such as tohave a certain combination of static and dynamic friction coefficients.

Additionally, or alternatively, the ability of the load-breaking liningelements 320 to resist load movement may be achieved by theload-breaking lining elements 320, compared to the lining elements ofthe second type, comprising a softer elastic material arranged to bedeformed by the weight of the load in order to restrict movement of theload in relation to the lining 300. Such elastic materials may be forexample rubber or polyurethane. The deformation results in a loadincreasing its grip to the lining surface, hence increasing the abilityof the load-braking lining element 320 to resist movement.

Additionally, or alternatively, the ability of the load-braking liningelements 320 to resist load movement may be achieved by theload-carrying surfaces of the load-breaking lining elements 320presenting, compared to load-carrying surfaces of the lining elements ofthe second type, a lower load-cohesion force for restricting movement ofthe load in relation to the lining 300.

The properties discussed hereinabove may be combined in different waysto form a suitable load-braking lining element 320. Other properties mayalso be varied in order to tailor a specific embodiment of aload-braking lining element 320.

ALTERNATIVE EXAMPLE

The inventive concept may be realized in many ways. Hereinbelow will bedescribed an example of a lining that may have some features in commonwith the lining according to the example embodiments describedhereinabove.

FIG. 1 shows a lining 100 being arranged to extend over inner surfacesof said haul truck body 10. The inner surfaces define at least oneimpact region 110 a,110 b and at least one wear region 120. The at leastone impact region 110 a,110 b comprises a loading region 110 a extendingover a part of the bottom surface 12 of the haul truck body 10 and afurther loading region 110 b extending over at least a part of the frontsurface 14 of the haul truck body 10. Furthermore, the at least one wearregion 120 comprises a tipping region 122 extending over another part ofthe bottom surface 12 of the haul truck body 10. The tipping region 122extends to the rear end 18 of the bottom surface 12 of the haul truckbody 10. The loading region 110 a is arranged in front of the tippingregion 122. The loading region 110 a extends forwardly from a center ofthe bottom surface 12 of the haul truck body 10.

The lining 100 within the at least one impact region 110 a,110 bpresents one or more impact lining elements 130. Furthermore, the lining100 within said at least one wear region 120 presents one or more wearlining elements 140. The impact lining elements 130 have a higher impactresistance than said wear lining elements 140 and the wear liningelements 140 have a higher wear resistance than the impact liningelements 130. The one or more impact lining elements 130 and the one ormore wear lining elements 140 are fastened to the haul truck body bymeans of through bolts, stud welded bolts or any other type of fixingwith a down holding force. The one or more impact lining elements 130and the one or more wear lining elements 140 preferably have the samethickness.

In the example, the one or more impact lining elements 130 comprises aplurality of impact lining elements arranged to extend over the at leastone impact region 110 a,110 b and the one or more wear lining elements140 comprises a plurality of wear lining elements arranged to extendover the at least one wear region 120. The plurality of impact liningelements 130 are arranged adjacent to each other such as together toform one or more areas of substantially uniform impact resistance.Similarly, the plurality of wear lining elements 140 are arrangedadjacent to each other such as together to form areas of substantiallyuniform wear properties.

The regions outside of the at least one impact region 110 a,110 b andthe at least one wear region 120 may comprise another, different, typeof lining elements. Such another type of lining elements may preferablybe of the same thickness as the at least one impact lining elements 130and the at least one wear lining elements 140.

The one or more impact lining elements 130 and the one or more wearelements 140 may comprise different materials. In the example, the oneor more impact lining elements 130 and/or the one or more wear liningelements 140 comprise rubber or polyurethane. The one or more impactlining elements 130 have a Young's modulus lower than a Young's modulusof the one or more wear lining elements 140. This allows for the one ormore impact lining elements 130 to present better impact resistance thanthe one or more wear lining elements 140.

One way to achieve a wear lining element is shown in FIGS. 2 a and b ,which show a wear lining element 240 comprising more than one material.The wear lining element 240 comprise one or more wear-resistant portions242 at least partly embedded within the one or more wear lining elements240 and distributed over at least a part of an outwardly directedsurface 246 of the wear lining element 240, such that the one or morewear-resistant portions 242 are arranged to make contact with materialpresent in said haul truck body 10. The one or more wear-resistantelements 242 comprise a ceramic material. The one or more wear liningelements 240 comprises a first layer 241 a facing the inside of the haultruck body 10 and a second layer 241 b facing surfaces of the haul truckbody 10, and wherein the first layer 241 a comprises the one or morewear-resistant elements 242. The first layer and the second layercomprises polyurethane. In other words, the one or more wear-resistantelements 242 is partly embedded in polyurethane.

At least some of the properties listed hereinabove may depend not onlyon the lining material but also on the load residing upon it. It is tobe understood that the properties that are to be compared to each otheris the properties measurable for each type of lining element whensupporting the same load, said load acting as a reference load. Forexample, the static friction of a load-braking lining element whensupporting a load should be compared to the static friction of a liningelement of the second type, supporting the same load.

As illustrated in FIG. 4 , a lining according to the inventive conceptmay have impact regions and wear regions within which lining elementsare arranged to have a high impact resistance and a high wearresistance, respectively. The lining may, additionally, haveload-braking regions and load-releasing regions within which liningelements are arranged to have a relative high load-braking capabilityand a relative high load-releasing capability, respectively. Two or moreof the regions discussed herein may overlap, at least partly. Forexample, a part of an impact region may also be a load-braking region.In such overlapping regions, lining elements may have more than onefunctionality. Thus, for the example, a lining element may have aresistance to impact and, additionally, being structured and arranged torestrict movement. It is understood that the impact, wear, load-brakingand load releasing regions may be located relative to each other in manyalternative ways.

Alternative Embodiments

The embodiment described above and as shown in the figures may be variedin many ways without departing from the scope of the claims.

The lining may comprise more than two types of lining elements. Forexample, a side lining element may be used on the side surfaces 24,26.Such a side lining element may have properties different from theproperties of the impact lining elements and the wear lining elements.For example, the side lining elements may have a different thickness.

The lining may comprise a further type of lining elements arranged overthe bottom surface of the haul truck body. Such a further type of liningelements may comprise a lining element with matching, or at least nearlymatching, wear and impact properties. Such lining elements may bearranged to extend over a part of the bottom surface located in betweenthe loading portion and the tipping portion.

The wear lining elements and the impact lining elements may comprisedifferent materials to fulfil the requested criteria for wear andimpact, respectively. For example, two or more materials may becombined, as layers and/or or a mix and/or as embedded inserts, such asceramic elements or specific alloys. It should thus be understood thatmany alternative ways exist for achieving said wear and impact liningelements within the scope of the claims.

The load-braking lining elements and the load-releasing lining elementsmay comprise different materials to fulfil the requested criteria forrestricting movement and promoting release of a load, respectively. Forexample, two or more materials may be combined, as layers and/or or amix and/or as embedded inserts, such as ceramic elements or specificalloys. It should thus be understood that many alternative ways existfor achieving said load-braking and load-releasing lining elementswithin the scope of the claims.

The invention claimed is:
 1. A lining being arranged to extend over ahaul truck body for carrying a load, said haul truck body having abottom surface, two side surfaces and a front surface, wherein thelining is formed by a plurality of lining elements comprising at least afirst type of lining elements, termed load-breaking lining elements, anda second type of lining elements, different from the load-breakinglining elements, said load-breaking lining elements being structured andarranged to restrict, to a higher degree than the second type of liningelements, movement of said load in relation to the lining, wherein saidplurality of lining elements comprises an elastic material, and whereinthe load-breaking lining elements, compared to the lining elements ofthe second type, comprises a softer elastic material arranged to bedeformed by the weight of the load in order to restrict movement of theload in relation to the lining, wherein the lining comprises aload-breaking bottom region formed entirely or partly by theload-breaking lining elements, and one or more further bottom regions,different from the load-breaking bottom region, formed entirely orpartly by the lining elements of the second type, wherein theload-breaking bottom region extends laterally between respective lateralsides of the bottom surface, and wherein the load-breaking bottom regionextends rearward of one or more further bottom regions.
 2. A liningaccording to claim 1, wherein load-carrying surfaces of theload-breaking lining elements present, compared to load-carryingsurfaces of the lining elements of the second type, a higher surfacefriction for restricting movement of the load in relation to the lining.3. A lining according to claim 1, wherein load-carrying surfaces of theload-breaking lining elements present, compared to load-carryingsurfaces of the lining elements of the second type, a lowerload-cohesion force for restricting movement of the load in relation tothe lining.
 4. A lining according to claim 1, wherein said liningcomprises a bottom lining, a front lining and two opposite side linings.5. A lining according to claim 4, wherein the load-breaking bottomregion is arranged at least partly over a load-impact region of aforward part of the haul truck body.
 6. A lining according to claim 4,wherein the load-breaking bottom region is arranged at a distance from afront end of the bottom lining.
 7. A lining according to claim 4,wherein the load-breaking bottom region is arranged at a distance from arear end of the bottom lining.
 8. A lining according to claim 4, whereineach one of said two opposite side linings comprises at least oneload-breaking side region formed entirely or partly by the load-breakinglining elements.
 9. A lining according to claim 1, wherein the secondtype of lining elements are designed as load-releasing lining elementswhich are structured and designed to promote, to a higher degree thanthe load-breaking lining elements, release of the load from the liningand/or movement of the load in relation to the lining.
 10. A liningaccording to claim 9, wherein at least some of said load-releasinglining elements are arranged in a front lining of said lining.
 11. Ahaul truck body comprising a lining according to claim
 1. 12. A truckcomprising a haul truck body according to claim 11.